neigh: document gc_thresh2

Missing documentation for gc_thresh2 sysctl.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 29a93518bf18..3cce8ea6b139 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -65,6 +65,12 @@ neigh/default/gc_thresh1 - INTEGER
         purge entries if there are fewer than this number.
         Default: 128
 
+neigh/default/gc_thresh2 - INTEGER
+        Threshold when garbage collector becomes more aggressive about
+        purging entries. Entries older than 5 seconds will be cleared
+        when over this number.
+        Default: 512
+
 neigh/default/gc_thresh3 - INTEGER
         Maximum number of neighbor entries allowed.  Increase this
         when using large numbers of interfaces and when communicating